Who owned the Oregon Territory before the Oregon Treaty of 1846 ceded the Pacific Northwest to the U. S.? A) Spain and Mexico
B) Britain
C) Russia
D) Britain and the United States

D) Britain and the United States.

Explanation: The land was shared by both countries before the Oregon Treaty of 1846.

the answer is use of support  

the quote by walter cronkite contributes to the central idea of the text by supporting the central idea. cronkite argues that what is deemed “right” for and in america may not be good for other countries. this supports the central idea of the text, that the vietnam war was unpopular in america for multiple reasons- including cronkite’s.